What can be done to slow the destruction of tooth decay?

Hawaii's water isn't fluoridated, so cavities are rampant here. So 8 yrs of anorexia (malnourishment, chronic dehydration, occasional purging) & depression so bad I'd go days/weeks btwn tooth brushing, most of my teeth are decayed in some form. 2 molars are so bad that my old metal fillings & half the tooth crumbled away to just dentin. 2 others were that bad but got pulled last year. It hurt so bad my ears rang & I'd scream & cry.

It wouldnt've got this bad had i been able to see a dentist for the past 6 yr! So a year ago my dad used credit cards to pay for exams, xrays, 2 fillings, & 2 $1000+ root canals w/only temp composite as we can't afford crowns. This was only possible cuz my dentist let us do a payment plan (no other dentists do that). But now we're too far behind on payments so he won't see me.

I still have all this painful crap. What can I do at home to slow down the damage? Besides good dental hygiene, benzocaine & eugenol for pain, & temp filling/ZOE? I'll do anything! I'll order stuff online & I am capable (dentist was shocked at how well Id put temp filling in, he thought a dentist had done it & said I should pursue dental school)!

Please don't say "just go to a dentist". I want to, ASAP! But that'll be no time soon! No access to money or credit/loans. There's no state coverage or free dentists for the poor. The ER/hospital dentist, dental school, & charity don't do root canals/major work. There are no options, now its just down to harm reduction.